Enable the RUF028 lint in Ruff

.ruff.toml

@@ -243,7 +243,7 @@ select = [
     "RUF024",  # Do not pass mutable objects as values to `dict.fromkeys`
     "RUF026",  # `default_factory` is a positional-only argument to `defaultdict`
 #    "RUF027",  # Possible f-string without an `f` prefix
-#    "RUF028",  # This suppression comment is invalid because {}
+    "RUF028",  # This suppression comment is invalid because {}
 #    "RUF029",  # Function `{name}` is declared `async`, but doesn't `await` or use `async` features.
     "RUF030",  # `print()` expression in `assert` statement is likely unintentional
 #    "RUF031",  # Use parentheses for tuples in subscripts.